by Chris Woodyard, USA TODAY

by Chris Woodyard, USA TODAY

If you're going to show off your flying car to keep enthusiasm going for the idea, you'd be hard pressed to find a better place than the EAA AirVenture fly-in in Oshkosh, Wis. this week.

Terrafugia's Transition "roadable" aircraft is making test flights at the show. The company is demonstrating how the craft can go from the highway to the skies by simply unfolding its wings, starting its propeller and roaring down the runway.

Oshkosh has become Mecca for private experimental aviation enthusiasts, with many flying in from around the country to be there. Displays fill fields with everything, basically, that can fly -- making a flying car not all that odd, really.

Out of several ideas for flying cars, the Transition is the idea that is farthest along. Even as it is being flight tested, the Woburn, Mass., maker says it is still perfecting the design. No specific production date has been announced.